add _WOLF_ROOT_DIR that points to wolf root directory

src/CMakeLists.txt

@@ -16,6 +16,13 @@ ENDIF()
 
 option(BUILD_EXAMPLES "Build examples" ON)
 
+# Does this has any other interest
+# but for the examples ?
+#IF(BUILD_EXAMPLES)
+  set(_WOLF_ROOT_DIR ${CMAKE_SOURCE_DIR})
+#ENDIF(BUILD_EXAMPLES)
+
+
 #find dependencies.
 
 FIND_PACKAGE(Eigen 3 REQUIRED)

src/internal/config.h.in

@@ -29,4 +29,6 @@
 
 #cmakedefine _WOLF_DEBUG
 
+#define _WOLF_ROOT_DIR "${_WOLF_ROOT_DIR}"
+
 #endif /* WOLF_INTERNAL_CONFIG_H_ */